In Korea, the chemical oxygen demand(CODsed) in freshwater sediments has been measured by the potassium permanganate method used for marine sediment because of the absence of authorized analytical method. However, this method has not been fully verified for the freshwater sediment. Therefore, the use or modification of the potassium permanganate method or the development of the new CODsed analytical method may be necessary. In this study, two modified CODsed analytical methods such as the modified potassium permanganate method for CODMn and the modified closed reflux method using potassium dichromate for CODCr were compared. In the preliminary experiment to estimate the capability of the two oxidants for glucose oxidation, CODMn and CODCr were about 70% and 100% of theoretical oxygen demand(ThOD), respectively, indicating that CODCr was very close to the ThOD. The effective titration ranges in CODMn and CODCr were 3.2 to 7.5 mL and 1.0 to 5.0 mL for glucose, 4.3 to 7.5 mL and 1.4 to 4.3 mL for lake sediment, and 2.5 to 5.8 mL and 3.6 to 4.5 mL for river sediment, respectively, within 10% errors. For estimating CODsed recovery(%) in glucose-spiked sediment after aging for 1 day, the mass balances of the CODMn and CODCr among glucose, sediments and glucose-spiked sediments were compared. The recoveries of CODMn and CODCr were 78% and 78% in glucose-spiked river sediments, 91% and 86% in glucose-spiked lake sediments, 97% and 104% in glucose-spiked sand, and 134% and 107% in glucose-spiked clay, respectively. In conclusion, both methods have high confidence levels in terms of analytical methodology but show significant different CODsed concentrations due to difference in the oxidation powers of the oxidants.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 시료채취
  2.2. 실험재료
  2.3. 담수퇴적물의 CODsed 분석
  2.4. 담수퇴적물에 대한 CODsed 분석조건 설정시험
  2.5. 퇴적물내 CODsed 회수율(Recovery, %) 분석
  2.6. 총유기탄소(Total organic carbon, TOC) 측정 및상관성 분석
 3. 결과 및 고찰
  3.1. Glucose에 대한 과망간산칼륨과 중크롬산칼륨의 산화력분석
  3.2. Glucose 주입량에 따른 과망간산칼륨과 중크롬산칼륨의 정량범위 결정
  3.2. 실퇴적물에 대한 각 CODsed 분석조건 결정
  3.3 매질에 따른 CODMn 법과 CODCr 법의 회수율 분석
  3.4 CODMn 법과 CODCr 법의 비교
  3.5 CODsed와 총유기탄소 측정 결과의 비교
 4. 결 론
 참 고 문 헌

• 최지연(경북대학교 건설환경에너지공학부) | Jiyeon Choi (Department of Architecture, Civil, Environmental and Energy Engineering, Kyungpook National University)
• 오상화(경북대학교 건설환경에너지공학부) | Sanghwa Oh (Department of Architecture, Civil, Environmental and Energy Engineering, Kyungpook National University)
• 신원식(경북대학교 건설환경에너지공학부) | Won Sik Shin (Department of Architecture, Civil, Environmental and Energy Engineering, Kyungpook National University) Corresponding author
• 박정훈(전남대학교 환경에너지공학과) | Jeong-Hun Park (Department of Environment and Energy Engineering, Chonnam National University)
• 황인성(부산대학교 사회환경시스템공학부) | Inseong Hwang (Department of Civil and Environmental Engineering, Pusan National University)
• 오정은(부산대학교 사회환경시스템공학부) | Jeong-Eun Oh (Department of Civil and Environmental Engineering, Pusan National University)
• 허진(세종대학교 환경에너지융합학과) | Jin Hur (Department of Environment and Energy, Sejong University)
• 신현상(서울과학기술대학교 환경공학과) | Hyun-Sang Shin (Department of Environmental Engineering, Seoul National University of Science and Technology)
• 허인애(국립환경과학원) | In-Ae Huh (National Institute of Environmental Research)
• 김영훈(안동대학교 환경공학과) | Young-Hoon Kim (Department of Environmental Engineering, Andong National University)